How can you properly test for a true BPO allergy?

The approach of conducting a patch test on the inner arm for three nights is the most reliable method for assessing a true allergy to benzoyl peroxide (BPO). A patch test allows for a controlled and direct observation of the skin's reaction to the substance. By applying BPO to a small area of skin and monitoring it over a specific period, one can effectively gauge whether the individual experiences any allergic response, such as redness, swelling, or irritation.

This testing method provides objective results and is an accepted practice in dermatology to confirm allergic reactions. Furthermore, it helps distinguish between a true allergy and other skin sensitivities that may not be of the allergic origin.

While discussing past experiences can offer valuable insight into a client's history with BPO, it does not provide definitive proof of an allergy. Similarly, attempting to persuade a client that they will not have a problem with BPO dismisses the importance of individualized testing and could lead to negative outcomes if an allergy does indeed exist.